i think i recently saw a headline saying that circumcision helped protect against HIV infection.
however, there is also the issue of what adult women prefer in their sexual partners.
I've seen such reports and I think they're bunk. The United States has less than half the population of Europe yet nearly twice as many cases of HIV. If circumcision is protective, then how come the United States with mostly circumcised men is so far worse off than Europe with almost entirely uncircumcised men?
I think the differences are cultural. In Africa where these studies are conducted most of the circumcised men are Muslim, and they are much less promiscuous than non-Muslim Africans.
PS. And it's worth noting that there are contradictory reports - some that find it makes a difference and others that disagree. So, in light of that, the dramatic difference in rates of infection between America and Europe is decisive for me.
And, moreover, it would not change my opinion in the slightest either way. The best protection against HIV is to not inject drugs and to not be a slut. Raising one's children properly will do far more to protect them than mutilating them possibly could.